Default Customizer Option for Featured Images

I know this is probably going to irritate quite a few Theme Developers, BUT please review this recent request that another end-user posted, and I responded to:
https://wordpress.org/support/topic/remove-featured-image-within-the-post?replies=2#post-7243807

It seems to me that the recent integration of the Theme Customizer into the Core should make this option possible for ALL new themes.

(Maybe I’m wrong since I’m not a coder…but it sure would be nice !)